Cryptoxyleborus mawdsleyi Beaver & Hulcr, 2008

Beaver, Roger A. & Hulcr, Jiri, 2008, A Review of the Ambrosia Beetle Genus Cryptoxyleborus Schedl (Coleoptera: Curculionidae: Scolytinae), The Coleopterists Bulletin 62 (1), pp. 133-153 : 133-153

Cryptoxyleborus mawdsleyi Beaver & Hulcr , new species

Female ( Fig. 2 ): 4.1 mm long, 3.1 times as long as wide, reddish brown. Frons narrow, weakly convex, subnitid, coarsely, densely punctured, the punctures with moderately long, fine hairs, a median longitudinal carina extending from the epistoma to just above the upper margin of the eyes. Eyes very large, coarsely facetted, fairly deeply emarginate, extending onto lower surface of head as well as onto frons. Antenna of type 4, the club subcircular, slightly wider than long, flattened, anterior face with basal segment extending about one–third of length of club, its apical margin strongly procurved, second segment corneous, narrow, procurved, third segment soft, not corneous, posterior face with two visible sutures. Pronotum of type 8 in dorsal view, 1.1 times as long as wide, base broadly arcuate, basal angles strongly rounded, sides weakly divergent in basal two–thirds, widest one–third from apex, apex very broadly rounded, summit well before middle, anterior slope convex, finely, densely asperate, the asperities transversely elongate, anterior margin without larger asperities, disc shining, very finely, moderately densely punctured, the punctures with fine, short hairs, vestiture longer on anterior slope and at sides, lateral margin rounded. Scutellum concealed beneath elytra. Elytra 2.2 times as long as wide, 1.8 times longer and slightly narrower than pronotum, with a deep, wide, longitudinal excavation beginning one–third from base of elytra and extending to apex, extending laterally across the greatly widened first interstriae and striae, its margins formed by the elevated and armed interstriae 2; basal margin carinate in front of large, subtriangular opening of mycangium on each elytron, basal angles quite strongly rounded, sides almost straight in basal two–thirds, then strongly convergent to very narrow apex, disc uniseriate–punctate, shining, excavation shallow at base, deepening posteriorly, its surface matt, with a double row of very coarse, shallow punctures, a few small tubercles at the base of the excavation on interstriae 1 and 2, then interstriae 2 strongly raised to form the margins of the excavation, and bearing a row of about 10 backwardly–directed pointed spines, extending to the elytral apex, one pair at the beginning of the declivity larger than the others and curved towards the midline, remaining interstriae bearing a row of granules or small spines towards the declivital apex, the whole elytra, except for the excavation, with a moderately dense vestiture of fine hairs, mostly semi–recumbent, but the median row on the interstriae erect on the declivity, the excavation with semi–recumbent hairs on the more anterior punctures. Protibiae inflated and granulate on posterior face, with six socketed teeth on the lateral margin, meso– and metatibiae flattened, each with seven socketed teeth. Abdominal ventrites 1 + 2 nearly 1.5 times longer than ventrites 3–5 together, all ventrites with fairly sparse, long hairs.

Holotype (female): BRUNEI. 115 ° 7 9 E, 4 ° 34 9 N, Kuala Belalong FSC, Dipterocarp forest, Dryobalanops beccarii, Aerial FIT 6, 275 m alt., 3.vii.91, N.Mawdsley NM215, BM( NH) 1991–173 (in BMNH).

Male: unknown.

The species is named for Dr. N. Mawdsley who collected many interesting scolytines during his research on coleopteran asssemblages in Brunei Darussalam.

The species is most closely similar to C. eggersi , C. major and C. turbineus , but is easily distinguished by the mycangia opening on the disc of the elytra and not on the basal slope, and the excavate elytra with a pair of large hooked spines on the margins of the excavation.

NOTES ON SPECIES

Here we consider both the species listed under Cryptoxyleborus by Wood and Bright (1992), and those that we consider should be included in the genus. New records which significantly extend the known distribution of a species are included, as well as brief notes on the biology of the species. It should be noted that the species listed by Wood and Bright (1992) as C. gracilior Browne is a synonym of Xyleborinus andrewesi (Blandford) ( Beaver 1995) , and is not considered further here. The following abbreviations are used in the new records: Dipt. (Dipterocarp), D. beccarii ( Dryobalanops beccarii Dyer ), FIT (Flight Intercept Trap), FSC (Field Studies Centre).

Figures

Fig. 2. Holotype of Cryptoxyleborus mawdsleyi Beaver & Hulcr, new species, female, dorsal and lateral aspect, 4.1 mm.